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11-13 2 - • No nucleus • Short life span – roughly 4...

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Blood composition Plasma 55% of total blood volume 49.5% of total volume is water (90% of 55%) more than 100 other small molecules globulins, albumins, clotting proteins Red blood cells (RBCs) 38-44% of total volume Platelets < 1% of total volume White blood cells < 1% of total volume
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Globulins are proteins bind to fat molecules to become lipoproteins low-density lipoprotein = LDL (= bad) high-density lipoproein = HDL (= good)
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Red Blood Cells
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Red Blood Cells flattened disk - why? flexibility reduced diffusion distance to the center of the cell No mitochondria - why?
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Unformatted text preview: • No nucleus • Short life span – roughly 4 months Oxygen transportation • four O 2 molecules per hemoglobin – four separate protein chains folded together oxyhemoglobin deoxyhemoglobin • millions of hemoglobin molecules per RBC • Hematocrit is percentage of total blood volume that is packed with RBCs – 43-49% in men, 37-43% in women – how is this controlled? Carbon monoxide (CO) • Binds to hemoglobin 200x more “tightly” than oxygen binds to hemoglobin – Popular sources include smoke, furnaces, exhaust...
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